How to Use Solutions from Previous Study as Initial Conditions

I'm trying to perform two RF simulations on the same model, but with two different sets of material definitions. The goal is to run a simulation on the first model and then use that solution as the background field in the second model. So far I have made two versions of the models differing only in materials.

I am having trouble "accessing" the solution from the first model. I have tried using both one study and two studies. When using one study I was expecting mod1.emw1.Ex would be the field from the first model, but COMSOL gives an error. When using two studies, I haven't found been able to find the correct syntax to access a stored solution.

Does anyone have any advice/leads on how to overcome this issue.

Thanks,